Collaborating Institutions Codes
AAS American Antiquarian Society
AKM Atwater Kent Museum
ATH Athenaeum of Philadelphia
FLP Free Library of Philadelphia
HSP Historical Society of Pennsylvania
LOC Library of Congress
LCP Library Company of Philadelphia
SI NMAH Smithsonian Institution, National Museum of American History
Home & Community Life (H&CL)
Graphic Arts (GA)
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The digital file names, including these codes, are often derived from the call number of the print assigned by the holding institution.